ctucan_err_interrupt(9)

💖 ctucan_err_interrupt — Error frame ISR 💖

okay so this is a page from the Kernel API Manual, and bestie, it's a tiny one but it's lowkey important. sit down, grab a strawberry 🍓, let's get into it.

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✨ NAME ✨

ctucan_err_interrupt — the Error frame ISR, aka the lil function that handles CAN error interrupts. it's giving "I'm the one who reports the drama" 💅

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🦋 SYNOPSIS 🦋

void ctucan_err_interrupt (struct net_device *ndev , u32 isr );

that's it. that's the whole signature. no cap. ✨

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🎀 ARGUMENTS 🎀

• ndev — a net_device pointer. yep, the classic. it's the network device we're working with 💖
• isr — the interrupt status register value, fr fr. this is the raw juicy intel we gotta decode 👑

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🌸 DESCRIPTION 🌸

so this is the CAN error interrupt handler, periodt. what it does is: it checks the type of error, and then it forwards the error frame up to the upper layers 🫶

that's the whole vibe check. error comes in → figure out what kind it is → pass it along. iconic behavior honestly 🧚

ngl it's a short one but it's doing real work. don't sleep on it 💀

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🌈 SEE ALSO 🌈

the kernel file itself lives at ./drivers/net/can/ctucanfd/ctucanfd_base.c — go say hi to it 💜

and here's the whole friend group, all of these are (9) man pages so they're all kernel-internal besties:

• ctucan_state_to_str(9)
• ctucan_reset(9)
• ctucan_set_btr(9)
• ctucan_set_bittiming(9)
• ctucan_set_data_bittiming(9)
• ctucan_set_secondary_sample_point(9)
• ctucan_set_mode(9)
• ctucan_chip_start(9)
• ctucan_do_set_mode(9)
• ctucan_get_tx_status(9)
• ctucan_is_txt_buf_writable(9)
• ctucan_insert_frame(9)
• ctucan_give_txtb_cmd(9)
• ctucan_start_xmit(9)
• ctucan_read_rx_frame(9)
• ctucan_rx(9)
• ctucan_read_fault_state(9)
• ctucan_get_rec_tec(9)
• ctucan_rx_poll(9)
• ctucan_rotate_txb_prio(9)
• ctucan_tx_interrupt(9)
• ctucan_interrupt(9)
• ctucan_chip_stop(9)
• ctucan_open(9)
• ctucan_close(9)
• ctucan_get_berr_counter(9)

like, the whole squad. go read them all, iykyk 😭💖

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okay that's the page!! mwah 💋

this little cutie comes from ./drivers/net/can/ctucanfd and the version/date on the tin is October 2026 — so yeah, from the future bestie, slay 🦋⭐👑